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Since January 2004, outbreaks of avian influenza (bird flu) among poultry have been reported in several parts of the world. In Vietnam and Thailand, avian influenza H5N1 outbreaks among poultry have been associated with illness and death in humans. In the United States, different avian influenza viruses have caused outbreaks among poultry, but no related illness in humans. However, one) human infection with influenza H7N2 virus of unknown origin was documented in the United States in November 2003. In British Columbia, Canada, an outbreak of H7N3 among poultry in 2004 was associated with human illness.
This section provides background information about recent avian influenza outbreaks and the risk to human health.
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